Drilling-machine.



M. W. SHERWOOD.

DRILLING MACHINE. APPLICATION msn MAR. 12. 19M.

Patente Nov. 23, 1915.

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MATHER W. SHERWOOD, OF FRANKLIN, PENNSYLVANIA, ASSIGNOR TO CHICAGO PNEUMATIC TOOL COMPANY, OF. CHIOAGQAILLENOIS, A CORPORATION OF NEW JERSEY,

Specification of Letters Patent.

DRILLING-MACHINEi Application filed March l2, 1914. Seril N0. 824,082.

To ZZ I/zom t may concern.'

Be it known that I, Martina lV. Si-nsnwoon, a. citizen of the United States, residing at Frankliin- `Venango county, ijennsylvania. have invented certain new and useful lmprovements in Drilling-Machines, of which the following is a specification.

My invention relates to a drilling machine and the object thereof is to provide assimple, eilicientand reliable machine of this character characterized by air feed mechanism and engine and rotatable drill chuck mechanism under the control of a single valve capable of supplying the motive vfluid direct to the drilling engine or indirectly thereto by first passing the motive fiuid through the mechanism for rotating the drill chuck. In the'present instance the motive fluid first passes throughthe air feed mechanism for extending the length of the drilling machine and for feeding the drill to its work. i

Tn the drawing, Figure l is a central longitudinal section ofmy'drilling machine; Fig. 2 a section on the line of Fig. l; Fig. 8 a. section on the line 3 3 of Fig. '9; and Fig. l a` section on the line l of Fig. l.

In the present instance I have shown my invention embodied in that type of drilling machine known as a stoper but it will be understood that such invention is not limited to such particular type but that I contemplate using my invention wherever applicable. However, for convenience my invention will be described in connection with this particular t)v pe of machine but without" intention of limitation thereto.

vThe drilling machine comprises the following several parts or mechanisms, first, the drilling engine which may be of any suitable construction, second, the mechanism for rotating the drill chuck which may be of any desired construction butA preferably of the. construction and operation shown, third, the air feed mechanism which is of suitable construction but preferably of the. telescoping cylinder type, and fourth, a-

block or head forming the back head of the drilling engine and also of the air feed mechanism and containing a valve for controlling the admission of the motive fluid to the drill chuck operating mechanism and to the drilling engine.

The drilling engine comprises a cylinder lhaving' a vpiston chamber :2

in which reciprocates the blows to an impact piece or anvil 4.- which in turn imparts its blows to the angular drill steel 5. The motive fluid is admitted to op posite ends ofthe piston chamber by means of a suitable distribution valve which is here in the form of a ball valve 5a governing the port and passage G leading to the front end of the piston chamberand the ports and` passages 7 and 8 leading to the rear end of the piston chamber. The exhaust is con` trolled by the piston itself through the two exhaust grooves 9 and l0.

The drillingv engine is provided at its front end withl a. front head ll between which and theV front endof the cylinder is interposed a bushing l2 within which the impact pieces` is located. This front head is interiorly fashioned so as to form a`tubu. lar bearing for a rotatable drill chuck 13 which has an angular central bore to receive the drill steel ,5. The inner end of this drill chuck is of 4enlarged diameter and formed as a worm gear 14C. The front head andthe interposed bushing are held onto the front end of the cylinder in suitable manner as by means of the bolts ll engaging respectively the cylinder and said front head.

The drill chuck operating mechanism comprises a pair of similar inter-meshing gears or rotors l5 secured to the two similar parallel shafts 1G bearing in the front head, as shown in Fig. 3, and provided at one end with or formed as worms 1T. yThese worms mesh with the worm gearll with the result that the rotation of the rotors' in opposite directions rotates the worm gear and consequently the drill chuck. The rotors are located 'in a casing formed on the front head and closed by a cap 1 8 which contains the motive fluid passage lf) which in turn communicates through the hollow dowels 20 with a motive fluid supply passage 2l. The supply of the motive fluid through these ports and passages and the means for governing the same will be hereinafter described.

The rear end of the engine cylini ier is closed by means of a back head or block secured or clamped theretoin any desired manner. This back head also forms a head for the air feed mechanism hereinafter explained. This back head has a central longitudinal Itatented Nov. 23, i915.

piston 3 adapted to impart its.

35 from-the space between. the two cylinders,

thence through'the interior of the inner cylconnected with one end ofthe valve. This valve has two main ways or passages 25 and 26, the former being adapted to connect between a 'port 27 in the back head and on oneside of thevalve chamber and a port 28 also in said back head but on the other side of the valve chamber, the latter port communicating with the passage 21. The other passage 26 is adaptedto communicate betweenl the port 29 and the supply ports 30 in the-back head, the port 29 communicating through the passage 31 and the hollow dowel 32 with the exhaust port 33 of the .fluid pressure mechanism operating the drill socket. In addition the plug valve 33 is provided with a transverse pori;v 3lA for the purpose of admitting the -mo'tive fluid'from the passage 26 to the port 30 and to the valve mechanism of engine when the valve 23 is turned 180 degrees from the position shown in Fig.

1, at which time said passage 26 will be in direct cominunicationwith the port 27.

The air feed mechanism comprises two telescoping cylinders 35.and 36, the former being the inner one and formed as a part of or rigidly secured to the back head and the former being the inner and movable one and adapted to slide along theinnen surface of the inner cylinder or tube. This inner cylinder is closed at its. outer endbut provided with a series' of ports 37vthrough4 which the motive fluid is adapted to flow inder to the port 2 7. The motive fluid communicates with'the outer cylinder through a port 3S t0 which is connected the motive fluid supply pipe 39 having throttle valve mechanism 40 controlled by the handle il and also having a shut-off valve 42. i

Describing the operation of the drilling machine and assuming'that the parts are in the relative position shown in Fig. 1, the motive fluid is admitted through the valve 40 to the air feed mechanism and Hows therethrough to the port 27. It then passes through the ports and passages 25, 28, 21, 20 and 19 to the fluid pressure mechanism for operating the drill socket and rotates the two rotors 15 in passing through the casing in whichl they are. located. rThe exhaust from this fluid pressure mechanism then passes to the drilling engine andv operates the same, the course of the motive fluid bei ing through the ports 33, 32, 31, 29, 26 and inFig. 1, the motive fluid is admitted to the drilling engine onlyindirectly, that is, through the rotors., but if desired the rotors may be cut out of operation and the motive fluid admitted direct to the drilling engine by turning the valve 23180 degrees whereupon the motive fluid will be admitted di' rectly from the port 27 through the ports and passages 26, 3e and 30y to the valve mechanism. v

It willbe understoodof course that when the motive fluid is admitted to the air feed mechanism the drilling machine is extended by the extension of the telescoping cylinders in-orderv to position the machine and the drill will thereafter be fed to its work by these telescoping. cylinders. It will also be understood that I refer to these cylinders as air7 feed mechanism because the motive fluid generally employed is 'compressed air. The air feed device is provided with means lfor releasing the motive fluid therein at the vent establishes communication between the feed cylinder and the atmosphere in the shut-off position of the valve.. In practice it is preferred to first operate I the ,drill engine without any chuck rotation in order that the drill may get' a start in the rock before thefdrill rotation begins. 1t. is obvious that in starting the machineiOO against a rock surface which is uneven or slantingit is desirable to have the chuck rotation inoperative in order that thel drillbit shall not travel about on the surface of the rock as would be liable to be the case if rotary motion were imparted to it at that time. In order to accomplish this result and at the same time bring the controlling meansl within convenient reach of the operator, the two-function valve 23 is arranged at the 110 central portion of the machine and is constructed to permit of initial or direct operation of the drilling engineA alone or the simultaneous operation'of the engine and as circumstances re- 115 of the spring pressed pin 24C which passes through one of a series of holes through the rim of the plug and into a hole inthe adjacent tubular portion of the plug 22. The handle 24 has on its inner side three recesses 330 into which the pin 24c 'is adapted to be projected in o'rderto determine or locate the Y different operative positions and neutralv ponsition of the valve 23.

washer 23@ of fibrous or resilient material is interposed between the 'head of the stem' 24a and the inner end of the screw plug. Thev spring 24d together with the fluid pressure in the valve chamber act to hold the head ofv and consequently I provide one or more holes 43which in the present instance pass throughvthe front head and also through the front end of the bushing l2. Inasmuch .as-

the hollow dowels 2() and 32 compel the proper location of the front head and prevent bushing l2 from turning it followsV that the holes through the front head and bushing must register and thereby provide the necessary outlets.

In order to minimize asmuch as possible the entrance of the chips and cuttings at thef front or upper end of the machine-I prefer' topprovide a cap 44 Which-screwslupon the extendedfront 'end of `the drillchilk and which extends over and partially surrounds the frontend of thehead 11 s0 as to shed or deect the chips'and cuttings and prevent themfrom entering the bearing.betweenjthe f f ,ont headof the rotating sleeve. By preference a locking nut 45 is p rovided on the extended end of the drill chuck to assist keeping the cap 12 in place.

lVIy drilling machine is also provided with an oil reservoir 46 which is provided with a minute passage 47 for supplying the oil directly to the worms and wormgear. Inaddition the machine is provided -With a reser- Avoir formed bythehollow handle 48, the oil passing through a minute passage 49 to one end of the valve 23. A

It will be understood that when the valve 23 is in a 90 position with respect to that illustrated, it closes all passages for supplying the motive iuidto the engine, this being Vthe proper position for the valve before the motive iuid is applied toextend the feed .cylinders x" I claim': l. In a drilling machine, the combination of a, drilling engine* including'a rotatable drill chuck, fluid pressure .operated 'mechanism for driving the chuck, iuid pressure feed mechanism for the engine, means for feeding motive fluid initially to the latter mechanism, and means for conducting the By preference a motive fluid from such mechanism to the drill chuck operating mechanism and thereupon to the drilling engine.

2. In a drilling machine, theJ combination of a drilling engine including a rotatable drill chuck, fluid pressure operated mechanism for' driving the chuck, fluid pressure vfeed mechanism -for the engine, a block i terposed between the engine and the fe d mechanism and having avalvechamber with ports communicating with such mechanism and also with the engine and the drill chuck operating mechanism, and a valve in said chamber cooperating with said ports and arranged to admit the .motive fluid first l to the drill chuck operating mechanism and thence to the en gine or direct to such engine.

, 3. In a drilling machine, the combination 'of 4a drilling engine including a`rotatable drill chuck, iuid pressure operated mechanism -for driving the chuck, fluid pressure --feed mechanism for the engine, a block interposed between the engine and-the feedV i mechanism and having a valve-chamber withports communicating with such mechanism and also with the engine andthe drillv chuckoperatingmechanism, and a cylindrical valve 'in saidchamber provided with passages coperating with said ports and a'r- ',ranged to admit the motive fluid first to the drill chuck operating mechanism and thence to the engine or direct to dsuch engine.

` 4. In a drilling machine, )the combination of a drilling engine including a rotatable vdrill chuck, fluid pressure operated `mechanism for driving the chuck,- fluid pressure feed mechanism for the engine, a block ini terposed between the engine and the feed mechanism and having a valve chamber with ports communicating with such mechanism and also with the engine and the drill chuck operating mechanism', and a cylindrical valve 1n said chamber provlded with two op-Y posi'te longitudinal passages 25 and 26, the

'passage 25 being arranged to connect between the feed mecha-nism and the drill' chuck operating mechanism and the passage 26. between such latter mechanism and the engine.l y

5. In a drilling machine, the combmationof a drilling engine including a rotatable drill chuck, fluid pressure operated mechanism for. driving the chuck, fluid pressure feed mechanism for the engine,- a block interposed between the engine and the feed .mechanism and having a valve' chamber j wlth ports communicating with such mechanism and also with the engine and the drill chuck operating mechanism, and acylindri- 'cal valve Yin said chamber provided with two opposite longitudinal passages 25 and 26 and a transverse passage 34 communicating with passage 26, the passage 25 being arranged in' one position of the valve to connect between the feed mechanism and the drill chuck operating mechanism and the passage .26 between such latter mechanism and the engine, and the passages 2G and' 3l inanother )osition of the valve to connect directly etueen 'the feed mechanism and the engine.

6. In a drilling machine, the combination of a drilling engine including a rotatable drill chuck, fluid pressure operated mechanism for driving the chuck, fiuid pressure feed mechanism for the engine, comprising telescoping cylinders having an inlet for admitting the motive fluid suppliedthereto and eventually to 'the drill chuck `mechanism and the engine, and valve mechanism interposed between the feed mechanism and the drill chuck mechanism and the engine for controlling the motive fluid to the drill chuck mechanism and thence. to the engine or direct to the engine, cutting out the drill chuck mechanism.

7. In a drillingr machine., the combination of a drillingr exigirle including a rotatable drill chuck, fluid pressure operated feed mechanism for the engine, u throttle valve l for controlling the admission of motive fluid directly to the feed mechanism and having avent which is open to atmosphere when the valve is closed, and means for coi1ducting the motive fluid from such mechanism to the drill chuck operating mechanism and therefrom to the drilling engine.

8. In a drilling machine, the combination of a drilling engine. including a rotatable drill chuck, fluid pressure operated mechanism for driving the chuck, and means for feeding motive fluid either direct to the engine or indirectlyv through the drill chuck mechanism, such meansl including a block 22 connected with the engine and having a .f

valve chamber, a valve ".23 therein, a plug at one end of the chamber, a handle having a stem passing therethrough and connected with the valve, and a spring pressed pin Q-l" passing through the plug and entering the block and adapted to ccperate with said handle to locate different positions thereof.

MATHER W. SHERVOOD.

'Witnessest JN0. B. lViLLIMis, Ha'r'rn: B. Hmxicn.

Copies 0f this patent may bo obtained for vo cents each, by addressing the Commissioner of Patents.

Washington, D. C." 

